The SDG-HAZOP(Signed Directed Graph,Hazard and Operability Analysis) is a qualitative safety assessment method,which is comprehensive,systematic and complete.However the result is tedious and large.Fault tree analysis...The SDG-HAZOP(Signed Directed Graph,Hazard and Operability Analysis) is a qualitative safety assessment method,which is comprehensive,systematic and complete.However the result is tedious and large.Fault tree analysis(FTA) is a logical and diagrammatic method,which is proved to be a useful quantitative analysis tool to evaluate the safety and reliability of complex systems.So a FTA based on SDG-HAZOP quantitative method was proposed in this paper.Firstly,the SDG-HAZOP and the FTA were established on the background of polypropylene production devices in the Sinopec Wuhan Branch.Secondly,the probability of top event was calculated by reliable data from the probability of basic events.Finally,the targeted measures were proposed to prevent fatal potential dangerous situations by probability calculation.展开更多
对于过程系统,危险与可操作性(Hazard and Operability,简称HAZOP)分析是一套应用最广的评价方法。但是人工评价存在费时、费力、成本高等缺点。本文介绍了一种基于SDG(Signed Directed Graph)的计算机辅助危险与可操作性分析系统,该系...对于过程系统,危险与可操作性(Hazard and Operability,简称HAZOP)分析是一套应用最广的评价方法。但是人工评价存在费时、费力、成本高等缺点。本文介绍了一种基于SDG(Signed Directed Graph)的计算机辅助危险与可操作性分析系统,该系统基于SDG定性模型。过程模型利用模型库中的单元模型建立,通用性强,且又能分析各种具体工艺的特定信息。应用实验表明,与人工专家评价相比,该系统具有完备性好、省时、省力、成本低、评价结果系统性和条理性强等众多优点。展开更多
At present, the modeling method used in the batch process by signed directed graph (SDG) is oriented to the process in normal running state, which cannot describe the operating logic in abnormal running state, and it ...At present, the modeling method used in the batch process by signed directed graph (SDG) is oriented to the process in normal running state, which cannot describe the operating logic in abnormal running state, and it is inadequate to cover all faults and hazards.When the SDG model used for computer-aided hazard and operability study (HAZOP) is built for the complex chemical process including the batch process, the model of the batch process cannot always be associated to that of the other continuous systems.In order to meet the demand of computer-aided HAZOP, the paper presents a dynamic SDG modeling method based on the present SDG-HAZOP modeling method to deal with the batch process.The idea and procedures of dynamic modeling were elaborated.A real case about the fly ash removal in a complex process of coal-to-oil was modeled and analyzed by using the proposed method, which can resolve two problems at the same time: the sequential model about the SDG modeling of the batch process and the maximal covering of the faults and hazards.展开更多
文摘The SDG-HAZOP(Signed Directed Graph,Hazard and Operability Analysis) is a qualitative safety assessment method,which is comprehensive,systematic and complete.However the result is tedious and large.Fault tree analysis(FTA) is a logical and diagrammatic method,which is proved to be a useful quantitative analysis tool to evaluate the safety and reliability of complex systems.So a FTA based on SDG-HAZOP quantitative method was proposed in this paper.Firstly,the SDG-HAZOP and the FTA were established on the background of polypropylene production devices in the Sinopec Wuhan Branch.Secondly,the probability of top event was calculated by reliable data from the probability of basic events.Finally,the targeted measures were proposed to prevent fatal potential dangerous situations by probability calculation.
文摘对于过程系统,危险与可操作性(Hazard and Operability,简称HAZOP)分析是一套应用最广的评价方法。但是人工评价存在费时、费力、成本高等缺点。本文介绍了一种基于SDG(Signed Directed Graph)的计算机辅助危险与可操作性分析系统,该系统基于SDG定性模型。过程模型利用模型库中的单元模型建立,通用性强,且又能分析各种具体工艺的特定信息。应用实验表明,与人工专家评价相比,该系统具有完备性好、省时、省力、成本低、评价结果系统性和条理性强等众多优点。
文摘At present, the modeling method used in the batch process by signed directed graph (SDG) is oriented to the process in normal running state, which cannot describe the operating logic in abnormal running state, and it is inadequate to cover all faults and hazards.When the SDG model used for computer-aided hazard and operability study (HAZOP) is built for the complex chemical process including the batch process, the model of the batch process cannot always be associated to that of the other continuous systems.In order to meet the demand of computer-aided HAZOP, the paper presents a dynamic SDG modeling method based on the present SDG-HAZOP modeling method to deal with the batch process.The idea and procedures of dynamic modeling were elaborated.A real case about the fly ash removal in a complex process of coal-to-oil was modeled and analyzed by using the proposed method, which can resolve two problems at the same time: the sequential model about the SDG modeling of the batch process and the maximal covering of the faults and hazards.
